Specifications

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EXTERNAL SPEAKER CONNECTION
In the master station rear panel is available a connector to plug an external speaker ,
which allows us to monitor the internal speaker in an external speaker.
The external speaker connection is via a 3.5 mm jack connector. The following table
shows the correspondence of the connector pins with the external speaker jack 3.5 mm:
EXTENAL SPEAKER CONNECTOR JACK 3/2”
SIGNAL TIP
WHITOUT CONNECT RING
GND SLEEVE
CONNECTION TO EXTERNAL INTERCOM UNITS
The external units connection to the base station is carried through twin-lead standard
microphone shielded cable and XLR-3-31/XLR-3-32 connectors . Each base station
channel provides one XLR-3-31 and one XLR-3-32 connectors wired internally in parallel.
The next list shows the signal distribution in the pin XLR connectors.
XLR-3-31/XLR-3-32 – INTERCOM LINE
PIN 1 GND
PIN 2 +VCC
PIN 3 SIGNAL
Certain rules have to be followed when installing the cables of an intercom system.
This is to avoid ground loops and to minimize the power loss and possible effect of
electromagnetic fields.
 Do not connect the XLR pin 1 to the XLR metal housing or to metal wall boxes to
avoid ground loops. The ground loop could increase notably the system background
noise.
 Do not close the intercom line connection (avoid closed loops). Each intercom line
leaves from the base station towards the remote stations, but it does not return to the
master station. If the connection is closed, a ground loop with the increase from the
system noise will take place.
 Use high quality cables and minimize its longitude. Avoid using low quality cables
and excessive cable runs as it affects in power loss, channel crosstalk and frequency
response.
 Place the base station in the closest possible position to the maximum consumption
zone; that is to say to the zone in which more external units are placed.
EF-202/EF-204 MASTER STATION – E200 SERIES
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RING.
SLEEVE.
TIP.
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